1. Anchor Text Over Optimization Tool
http://www.removeem.com/ratios.php
Worried about Google's Penguin algorithm hitting you for over-optimized anchor text? Simply type in your URL for a full report of which links might raise flags.

2. Bing Webmaster Tools
http://www.bing.com/toolbox/webmaster
Similar in function to Google Webmaster Tools, Bing offers a suite of interesting research tools and resources for webmasters.

3. Bitly
https://bitly.com/
Most people use Bitly for URL shortening, but the real power of this platform comes from its analytics.

4. Boomerang
http://www.boomeranggmail.com/
Boomerang lets you follow up on emails, even when you forget. Great for link building or any time you send a lot of emails.

5. Buffer
https://bufferapp.com/
Optimize your online social media sharing. Buffer allows you to share with your audience at the optimal times for greater visibility.

6. BuiltWith
http://builtwith.com/
Use BuiltWith to discover what technology nearly any website was, well, built with. Great for competitive intelligence as well.

7. Buzzstream Tools Suite
http://tools.buzzstream.com/link-building
Link Building, Tools Suite, Email
Most people know Buzzstream as an outreach platform, but they also offer a number of free link-building tools. This company gets it.

11. Convert Word Documents to Clean HTML
http://word2cleanhtml.com/
Content, Productivity
Despite the rise of Google Docs, Word still dominates much of the world. Copying and pasting has always been a hurdle, but this tool makes it easy.

12. Copyscape
http://www.copyscape.com/
Content
Copyscape serves both as a plagiarism checker and a duplicate-content checker. Great to use if your content has been distributed across the web.

13. Domain Hunter Plus
http://domainhunterplus.com/
Link Building
This magic extension for Chrome not only helps you find important broken links, but also tells you if the links point to an available domain.

19. Google Keyword Planner
http://adwords.google.com/keywordplanner
Keyword Research
The tool to replace Google's popular keyword tool has been derided by some, but still offers data not available anywhere else.

20. Google Analytics
http://www.google.com/analytics/
Analytics
The most popular of all the analytics tools available, Google Analytics continually innovates and sets the standard.

21. Google Analytics API
https://support.google.com/analytics/answer/1008004?hl=en&ref_topic=1008008
API, Analytics
The Google Analytics API is great for building custom reports and tools, and also for pulling data straight into Excel or Google Docs.

22. Google Map Maker
http://www.google.com/mapmaker
Local
Among other things, Google Map Maker allows you to contribute to public map information, which may be shared and incorporated into Google Maps.

24. Google Public Data
http://www.google.com/publicdata/directory
Content
Drawing on vast public databases, Google public data offers a great starting point for content research, infographics, and more.

26. Google Structured Data Testing Tool
http://www.google.com/webmasters/tools/richsnippets
Structured Data, Technical SEO
If you use Schema.org microformats or any other type of structured data, this tool will verify your markup.

27. Google Trends
http://www.google.com/trends/
Keyword Research
See what's trending in Google search results and view keyword search popularity over time. A must for trends.

28. Google Webmaster
http://www.google.com/webmasters/
Tools Suite, Diagnostic
The interface recently received an overhaul, and Google Webmaster remains a must-have resource of diagnostic and health tools for site owners.

29. IFTTT
https://ifttt.com/
Productivity
IFTTT stands for IF This, Then That. The tool allows you to create automatic triggers between various apps, like Gmail and Twitter.

30. Infogr.am
http://infogr.am/
Infographics
A great free Infographics resource that allows you to easily create graphics and data visualizations.

31. Internet Marketing Ninjas SEO Tools
http://www.internetmarketingninjas.com/tools/
Tools Suite
The Ninjas are some of the best SEOs and online marketers out there, and they've put some of their best tools online for free.

32. Linkstant
http://www.linkstant.com/
Link Building
This nifty analytics tool alerts you anytime someone links to your website. Great for outreach and intelligence gathering.

33. Linksy.me Email Guesser
http://linksy.me/find-email
Email, Link Building
Need to send an email, but you don't have the recipient's address? Type in what you know and this nifty tool will help you figure it out.

34. MailTester.com
http://mailtester.com/
Email
Need to send an email to an untested address, but you don't want to spam them? Check it first with this mail tester to verify.

35. MozCast
http://mozcast.com/
SERP Tracking, Moz
Want to know if Google is testing its algorithm this week? MozCast gives you a daily weather report to track changes in the SERPs.

36. MyBlogGuest
http://myblogguest.com/
Link Building, Content
Guest blogging is still alive and thriving. MyBlogGuest helps you find the good opportunities out there.

37. Panguin Tool
http://www.barracuda-digital.co.uk/panguin-tool/
Analytics
This awesome tool connects with your Google Analytics account to help you see if and when you've been hit by Google Algorithm updates.

39. Piwik
http://piwik.org/
Analytics
Piwik is a lightweight web analytics solution, and a great alternative to Google Analytics.

40. Rank Checker for Firefox
http://tools.seobook.com/firefox/rank-checker/
Rank Tracking
This light and easy desktop tool checks rankings with the click of a button. Quick, easy and free.

41. Rapportive
http://rapportive.com/
Email, Link Building, Productivity
Rapportive works with your Gmail inbox to give you near-instant rich contact information for almost everyone you want to reach. A must-have for marketers.

42. Remove Duplicate Items
http://ontolo.com/tools-remove-duplicates
Productivity
Ontolo offers a suite of link building software and a few helpful productivity tools for link builders. The remove duplicates tool solves a common problem.

44. Schema Creator
http://schema-creator.org/
Structured Data, Technical SEO
Everyone loves using Schema.org, but the microformats are difficult to write by hand. This generator from the folks at Raven simplifies the task.

45. Scraper for Chrome
https://chrome.google.com/webstore/detail/scraper/
Productivity
If you've never scraped a webpage, you're missing out. Scraper for Chrome puts the power of simple web scraping in your hands without the need for code.

46. Seer Toolbox
http://www.seerinteractive.com/seo-toolbox/
Tools Suite, Analytics, Link Research
SEER opened up its internal toolbox for everyone in the world to use. These are the same tools used in-house at SEER, and they rock.

47. SEO Toolbar
http://tools.seobook.com/seo-toolbar/
Tools Suite, Toolbar, Technical SEO
On of the most popular tools available, The SEO Toolbar puts a ton of information at your fingertips including backlinks and competitive research.

48. SEO Tools for Excel
http://nielsbosma.se/projects/seotools/
Tools Suite, Analytics, Social
You don't need to be an Excel ninja to use Niels Bosma's SEO Tools for Excel. This plugin does so many things many SEOs won't work without it.

49. SEOgadget Links API
http://seogadget.com/api/
API, Link Research
The SEOgadget Links API lets you easily gather not only backlink data but contact information as well. A huge time saver.

50. SEOgadget Tools
http://seogadget.com/tools/
Tools Suite
This suite of tools from the Gadget lab includes several Excel plugins, a content strategy generator, and more.

52. SharedCount
http://www.sharedcount.com/
Social, Analytics
Want to know how any piece of content was shared socially across the major services? This is the tool to use.

53. SharedCount API
http://www.sharedcount.com/documentation.php
API, Social
Harnessing the combined statistics of Google+, Twitter, Facebook, and more, the SharedCount API puts a ton of social data at your fingertips.

54. Similar Page Checker
http://www.webconfs.com/similar-page-checker.php
Content, Technical SEO
Use this tool to check for duplicate content issues. The Similar Page Checker will give you a score of how closely the HTML of two pages resemble each other.

55. Sitemap Generators
http://code.google.com/p/sitemap-generators/wiki/SitemapGenerators
Sitemaps
Google offers a slew of free, top-notch sitemap generators. Most of these live on your server and generate new sitemaps automatically.

56. Social Authority API
https://followerwonk.com/social-authority
API, Social
How much reach and social authority do your followers have? How about the people you're trying to connect with? The free Social Authority API will tell you.

57. Social Crawlytics
https://socialcrawlytics.com/
Social, Analytics
Social Crawlytics allows you to conduct competitive research by showing you your competitors' most-shared content. Lots of other features as well.

58. Social Mention
http://www.socialmention.com/
Social
Social mention offers real-time social media search and analysis. Enter a search term and see who's sharing what, right now.

59. Text Cleaner
http://www.textcleanr.com/
Content
Some of the best tools solve the simplest problems. Text cleaner cleans up all kinds of text formatting when copying and pasting between aplications.

60. Ubersuggest
http://ubersuggest.org/
Keyword Research
Every SEO loves Ubersuggest for its ease of use and wealth of keyword research ideas. Utilizing the power of Google Suggest, it returns hundreds of potential results.

62. Virante SEO Tools
http://www.virante.org/seo-tools
Tools Suite
Virant offers a number of high quality SEO tools to the public. These are often the same tools developed for the Virant team, opened up for public use.

63. Wayback Machine
http://archive.org/web/web.php
Competitive Intelligence
Want to see the history of your website or your competitor's site? The Wayback Machine allows you to step back in time and track important changes.

69. Yahoo Pipes
http://pipes.yahoo.com/pipes/
Content, Productivity
A great mashup tool that combines different feeds into content and other magical creations. Used for link building and whatever you can dream of.

70. Yoast WordPress SEO Plugin
http://yoast.com/wordpress/seo/
Technical SEO
If you could only choose one WordPress plugin for you site, the first would be from Yoast, and so would the second. This one sets the standard.

Free and Paid
72. Ahrefs
https://ahrefs.com/
Link Research, Link Building
One of the more popular link research tools, Ahrefs offers a large index and nice anchor text distribution charts. Mostly a paid tool, but they offer some free data.

74. CloudFlare
https://www.cloudflare.com/
Speed
How do they make CloudFlare free? It works both as a CDN and a security service to provide your website with speed and safety.

75. Followerwonk
https://followerwonk.com/
Social, Analytics, Moz
Perhaps the coolest thing about Followerwonk is the ability to track your followers. Smart SEOs also use it for outreach and research.

76. Keyword Eye
http://www.keywordeye.com/
Keyword Research
Keyword eye adds a twist to keyword research by adding rich visualizations ? essential when you want to move beyond keywords to valuable concepts.

77. KnowEm
http://knowem.com/
Social
KnowEm allows you to check 100's of social profiles at once to check availability. Looking for the perfect brand name? Check KnowEm first.

78. Majestic SEO
http://www.majesticseo.com/
Link Research, Competitive Intelligence, Link Building
You've probably seen Majestic SEO link charts all over the Internet. Great crawling technology combined with several free options make for great link research.

79. Majestic SEO API
http://blog.majesticseo.com/general/majestic-seo-api-now-explained/
API, Link Research
Majestic makes much of its backlink data available for free via its API.

81. Mozscape API
http://moz.com/products/api
API, Link Research, Moz
Companies everywhere incorporate the Mozscape API into their own products, but it's also available to individuals, and much of the data is free.

82. nTopic
http://www.ntopic.org/
Content
nTopic is one of the few proven methods for giving your content a relevancy score and offering keyword suggestions to improve it.

83. Open Site Explorer
http://www.opensiteexplorer.org/
Link Research, Moz, Competitive Intelligence, Link Building
When Google and Yahoo started removing backlink data from the public, Moz built Open Site Explorer to fill a huge need. See backlinks, anchor text, popularity metrics and more.

88. SEMrush
http://www.semrush.com/
Tools Suite, Keyword Research, Competitive Intelligence
The paid and organic keyword data offered by SEMrush is often scary good and comprehensive. Also great for researching competitors' ads.

89. SERPmetrics
http://serpmetrics.com/flux/
SERP Tracking, Competitive Intelligence
SERPmetrics flux charts track the flux for US search results across Yahoo, Bing and Google over a 30-day period. A paid API is also available.

90. SimilarWeb
http://www.similarweb.com/
Competitive Intelligence
Impressive competitive intelligence across a number of online industries. Competitor website stats are hard to come by, but Similar Web does a good job.

91. StatCounter
http://statcounter.com/
Analytics
Free, quick, and lightweight analytics solution. Often used by those who want to avoid using Google Analytics for privacy reasons.

92. Trello
https://trello.com/
Productivity
Project management and tracking made simple. Used and endorsed by Moz.

93. Whitespark Local Citation Finder
https://www.whitespark.ca/local-citation-finder/
Local
Finding local citations is key to local SEO. Whitespark offers a number of free and paid solutions to find the local citations to rise above the competition.

96. Moz Analytics
http://moz.com/products
Tools Suite, Diagnostic, Moz, Rank Tracking, Social
The flagship of the Moz software suite, Moz Analytics offers a dashboard of all your important marketing data in one place with actionable analytics for better marketing.

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